Application Of Communication Technology In City's Trail Transportation

City's trail transportation has been gaining increasing importance in public transportation of modern cities. How to ensure the trail transportation a secure and reliable one involves complicated information application and its management. As a sophisticated integrated system, trail transportation cannot do away with the transmission of information, which functions as the nervous or network system for trail transportation.However, concerning communication transmission technology, the communication circle and academic circle have heated debates and have not reached any uniform norms or standards. Based on his experience when taking charge of Shanghai Xinmin Route and Pearl Route communication system construction, and research and analysis shared with experts on management, designing, construction and monitoring as well, the author proposes a whole set of overall requirements, objects and principles of communication technology to meet the safety running of the city's trail system. City's trail communication transmission system mainly contains: key technology of city's trail communication transmission, choice of transmission module, choice of building transmission network andrectification in practical projects.This thesis has principally conducted research in the following aspects:1. It has rather thoroughly and systematically delineated the major contents in City's trail transportation communication system: transmission, business, wireless, specialist, monitor, broadcast, clock, power, cable, ground, auto ticket selling and checking, FAS, SCADA, auto fire siren etc.2. Concerning the choice of transmission modules of backbone network, it hasgiven ample account and has conducted analytical research on various forms of transmission technology and features in terms of SDH, ATM, OTN and wideband IP technology that have been accredited by communication circles. Besides transmission network which constitutes the main import of this thesis, it has also touched upon the interfacing technology and requirements of the related communication sub-systems in order to meet the international standards and be compatible.3. In the aspect of the choice of the comprehensive network schemes, it proposes to have the whole communication network categorized into backbone networks and specialist networks, due to the fact that City's trail transportation involves vast investment and lengthy construction and must be implemented line after line , period after period, etc. How to connect pots of specialist networks to backbone network so as to effect business transmission across lines has also been discussed.This thesis has reached the following conclusions:City's trail transportation must be equipped with special, complete and independent communication system in order to ensure the transportation's security, reliability, punctuality and efficiency, and also to enable an uniform direction over all runnings.In the aspect of the application of communication technology in city's trail transportation, transmission technique of SDH functions as the most principal method. To accommodate information data flow (voice, visual and graphic) fromvarious communication sub-systems , to choose appropriate means of building SDH networks and SDH transmission modules constitute the keys to the application of communication technology in City's trail transportation. Moreover, the views proposed here have been proven right through practical projects.